[stdlib] Improve unavailable diagnostics

Making these generic and removing inout from the arguments cuts down on
the number of useless notes we give users when they try to use them.
Arguably the compiler should do better, but this moves our test results
along.

Author: Dave Abrahams

stdlib/public/core/FloatingPointTypes.swift.gyb

@@ -914,43 +914,6 @@ extension ${Self} : Strideable {
 // Deprecated operators
 //===----------------------------------------------------------------------===//
 
-@_transparent
-@available(*, unavailable, message: "Use truncatingRemainder instead")
-public func % (lhs: ${Self}, rhs: ${Self}) -> ${Self} {
-  fatalError("% is not available.")
-}
-
-@_transparent
-@available(*, unavailable, message: "Use formTruncatingRemainder instead")
-public func %= (lhs: inout ${Self}, rhs: ${Self}) {
-  fatalError("%= is not available.")
-}
-
-@_transparent
-@available(*, unavailable, message: "use += 1")
-@discardableResult
-public prefix func ++ (rhs: inout ${Self}) -> ${Self} {
-  fatalError("++ is not available")
-}
-@_transparent
-@available(*, unavailable, message: "use -= 1")
-@discardableResult
-public prefix func -- (rhs: inout ${Self}) -> ${Self} {
-  fatalError("-- is not available")
-}
-@_transparent
-@available(*, unavailable, message: "use += 1")
-@discardableResult
-public postfix func ++ (lhs: inout ${Self}) -> ${Self} {
-  fatalError("++ is not available")
-}
-@_transparent
-@available(*, unavailable, message: "use -= 1")
-@discardableResult
-public postfix func -- (lhs: inout ${Self}) -> ${Self} {
-  fatalError("-- is not available")
-}
-
 % if bits == 80:
 #endif
 % end
@@ -1006,3 +969,40 @@ extension ${Self} {
 }
 
 % end # for (bits, signed) in allInts()
+
+@_transparent
+@available(*, unavailable, message: "Use truncatingRemainder instead")
+public func % <T: FloatingPoint> (lhs: T, rhs: T) -> T {
+  fatalError("% is not available.")
+}
+
+@_transparent
+@available(*, unavailable, message: "Use formTruncatingRemainder instead")
+public func %= <T: FloatingPoint> (lhs: T, rhs: T) {
+  fatalError("%= is not available.")
+}
+
+@_transparent
+@available(*, unavailable, message: "use += 1")
+@discardableResult
+public prefix func ++ <T: Arithmetic> (rhs: T) -> T {
+  fatalError("++ is not available")
+}
+@_transparent
+@available(*, unavailable, message: "use -= 1")
+@discardableResult
+public prefix func -- <T: Arithmetic> (rhs: T) -> T {
+  fatalError("-- is not available")
+}
+@_transparent
+@available(*, unavailable, message: "use += 1")
+@discardableResult
+public postfix func ++ <T: Arithmetic> (lhs: T) -> T {
+  fatalError("++ is not available")
+}
+@_transparent
+@available(*, unavailable, message: "use -= 1")
+@discardableResult
+public postfix func -- <T: Arithmetic> (lhs: T) -> T {
+  fatalError("-- is not available")
+}