libclc fail to build after [OpenCL] Add builtin declarations by default.

[llvmbot]

Bugzilla Link	49431
Version	unspecified
OS	All
Attachments	testLLAsmCompiler.bc.temp
Reporter	LLVM Bugzilla Contributor
CC	@tstellar

Extended Description

clang commit cf3ef15

result:
-- Check for working LLAsm compiler: /usr/bin/llvm-as -- broken
CMake Error at cmake/CMakeTestLLAsmCompiler.cmake:40 (message):
The LLAsm compiler "/usr/bin/llvm-as" is not able to compile a simple test
program.

It fails with the following output:

Change Dir: /build/libclc-git/src/llvm-project-git/libclc/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_e2881 && [1/2] Building LLAsm
object CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc

FAILED: CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc

/usr/bin/clang -E -P -x cl testLLAsmCompiler.ll -o
CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc.temp && /usr/bin/llvm-as -o
CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc
CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc.temp

/usr/bin/llvm-as: CMakeFiles/cmTC_e2881.dir/testLLAsmCompiler.bc.temp:1:1:
error: expected top-level entity

typedef unsigned char uchar;

^

ninja: build stopped: subcommand failed.

Solution:
Add -cl-no-stdinc