[clang][AST] Fix spaces in TypePrinter for some calling convs (#143160)

There needs to be a space as the first character, otherwise the printed
function prototype will have the CC attribute attached to the final `)`.

I noticed this looking at the AST for a function with
`__attribute__((device_kernel))`

---------

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

clang/docs/ReleaseNotes.rst

@@ -842,6 +842,7 @@ Bug Fixes to AST Handling
 - Fixed type checking when a statement expression ends in an l-value of atomic type. (#GH106576)
 - Fixed uninitialized use check in a lambda within CXXOperatorCallExpr. (#GH129198)
 - Fixed a malformed printout of ``CXXParenListInitExpr`` in certain contexts.
+- Fixed a malformed printout of certain calling convention function attributes. (#GH143160)
 
 Miscellaneous Bug Fixes
 ^^^^^^^^^^^^^^^^^^^^^^^

clang/lib/AST/TypePrinter.cpp

@@ -1095,13 +1095,13 @@ void TypePrinter::printFunctionAfter(const FunctionType::ExtInfo &Info,
       OS << " __attribute__((pcs(\"aapcs-vfp\")))";
       break;
     case CC_AArch64VectorCall:
-      OS << "__attribute__((aarch64_vector_pcs))";
+      OS << " __attribute__((aarch64_vector_pcs))";
       break;
     case CC_AArch64SVEPCS:
-      OS << "__attribute__((aarch64_sve_pcs))";
+      OS << " __attribute__((aarch64_sve_pcs))";
       break;
     case CC_DeviceKernel:
-      OS << "__attribute__((device_kernel))";
+      OS << " __attribute__((device_kernel))";
       break;
     case CC_IntelOclBicc:
       OS << " __attribute__((intel_ocl_bicc))";

clang/test/AST/ast-dump-type-callingconv.cpp

@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -triple aarch64 -ast-dump -ast-dump-filter foo %s \
+// RUN: | FileCheck --strict-whitespace %s
+
+// CHECK: foo1 'void () __attribute__((device_kernel))'{{$}}
+void foo1() __attribute__((device_kernel));
+
+// CHECK: foo2 'void () __attribute__((aarch64_vector_pcs))'{{$}}
+void foo2()  __attribute__((aarch64_vector_pcs));
+
+// CHECK: foo3 'void () __attribute__((aarch64_sve_pcs))'{{$}}
+void foo3()  __attribute__((aarch64_sve_pcs));