Tests: Split skip-function-bodies.swift into multiple tests.

This makes the main skip-function-bodies.swift test easier to maintain because
there are fewer `RUN:` lines to wade through in the output. The early `RUN:`
lines that redirect stderr to stdout were also making iterative debugging very
painful.

Author: tshortli

test/Frontend/skip-function-bodies-Onone.swift

@@ -0,0 +1,5 @@
+// RUN: %target-swift-frontend -typecheck -experimental-skip-non-inlinable-function-bodies -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s
+// RUN: %target-swift-frontend -typecheck -experimental-skip-non-inlinable-function-bodies-without-types -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s
+// RUN: %target-swift-frontend -typecheck -experimental-skip-all-function-bodies -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s
+
+// CHECK: module 'SwiftOnoneSupport' cannot be built with any of the -experimental-skip-*-function-bodies* flags; they have been automatically disabled

test/Frontend/skip-function-bodies.swift

@@ -1,20 +1,5 @@
 // RUN: %empty-directory(%t)
 
-// Check -emit-ir and -c are invalid when skipping function bodies
-// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-non-inlinable-function-bodies %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// RUN: not %target-swift-frontend -c %s -experimental-skip-non-inlinable-function-bodies %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-non-inlinable-function-bodies-without-types %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// RUN: not %target-swift-frontend -c %s -experimental-skip-non-inlinable-function-bodies-without-types %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-all-function-bodies %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// RUN: not %target-swift-frontend -c %s -experimental-skip-all-function-bodies %s 2>&1 | %FileCheck %s --check-prefix ERROR
-// ERROR: the -experimental-skip-*-function-bodies* flags do not support emitting IR
-
-// Warn when trying to build SwiftONoneSupport with any skip enabled
-// RUN: %target-swift-frontend -typecheck -experimental-skip-non-inlinable-function-bodies -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s --check-prefix WARNING
-// RUN: %target-swift-frontend -typecheck -experimental-skip-non-inlinable-function-bodies-without-types -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s --check-prefix WARNING
-// RUN: %target-swift-frontend -typecheck -experimental-skip-all-function-bodies -module-name SwiftOnoneSupport %s 2>&1 | %FileCheck %s --check-prefix WARNING
-// WARNING: module 'SwiftOnoneSupport' cannot be built with any of the -experimental-skip-*-function-bodies* flags; they have been automatically disabled
-
 // Check skipped bodies are neither typechecked nor SILgen'd
 // RUN: %target-swift-frontend -emit-sil -emit-sorted-sil -experimental-skip-non-inlinable-function-bodies -debug-forbid-typecheck-prefix NEVERTYPECHECK -debug-forbid-typecheck-prefix INLINENOTYPECHECK %s -o %t/Skip.noninlinable.sil
 // RUN: %target-swift-frontend -emit-sil -emit-sorted-sil -experimental-skip-non-inlinable-function-bodies-without-types -debug-forbid-typecheck-prefix NEVERTYPECHECK -debug-forbid-typecheck-prefix TYPESNOTYPECHECK %s -o %t/Skip.withouttypes.sil

test/IRGen/skip-function-bodies.swift

@@ -0,0 +1,8 @@
+// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-non-inlinable-function-bodies %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -c %s -experimental-skip-non-inlinable-function-bodies %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-non-inlinable-function-bodies-without-types %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -c %s -experimental-skip-non-inlinable-function-bodies-without-types %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -emit-ir %s -experimental-skip-all-function-bodies %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -c %s -experimental-skip-all-function-bodies %s 2>&1 | %FileCheck %s
+
+// CHECK: the -experimental-skip-*-function-bodies* flags do not support emitting IR