[test] HotColdSplit: cover use of opaque pointer type

Add a test to cover the case where an extracted block contains a
lifetime marker for a pointer with an opaque type.

(cherry picked from commit da27beb)

Author: vedantk

llvm/test/Transforms/HotColdSplit/lifetime-markers-on-inputs-3.ll

@@ -0,0 +1,47 @@
+; RUN: opt -S -hotcoldsplit -hotcoldsplit-threshold=0 < %s 2>&1 | FileCheck %s
+
+%type1 = type opaque
+%type2 = type opaque
+
+declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
+
+declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
+
+declare void @use(%type1**, %type2**)
+
+declare void @use2(%type1**, %type2**) cold
+
+; CHECK-LABEL: define {{.*}}@foo(
+define void @foo() {
+entry:
+  %local1 = alloca %type1*
+  %local2 = alloca %type2*
+  %local1_cast = bitcast %type1** %local1 to i8*
+  %local2_cast = bitcast %type2** %local2 to i8*
+  br i1 undef, label %normalPath, label %outlinedPath
+
+normalPath:
+  call void @use(%type1** %local1, %type2** %local2)
+  ret void
+
+; CHECK-LABEL: codeRepl:
+; CHECK: [[local1_cast:%.*]] = bitcast %type1** %local1 to i8*
+; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local1_cast]])
+; CHECK-NEXT: [[local2_cast:%.*]] = bitcast %type2** %local2 to i8*
+; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local2_cast]])
+; CHECK-NEXT: call void @foo.cold.1(i8* %local1_cast, i8* %local2_cast
+
+outlinedPath:
+  call void @llvm.lifetime.start.p0i8(i64 1, i8* %local1_cast)
+  call void @llvm.lifetime.start.p0i8(i64 1, i8* %local2_cast)
+  call void @use2(%type1** %local1, %type2** %local2)
+  call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
+  call void @llvm.lifetime.end.p0i8(i64 1, i8* %local2_cast)
+  br label %outlinedPathExit
+
+outlinedPathExit:
+  ret void
+}
+
+; CHECK-LABEL: define {{.*}}@foo.cold.1(
+; CHECK-NOT: @llvm.lifetime