Derive builtin return type from its definition
Summary: Prior to this patch, OpenCL code such as the following would attempt to create a BranchInst with a non-bool argument: if (enqueue_kernel(get_default_queue(), 0, nd, ^(void){})) /* ... */ This patch is a follow up on a similar issue with pipe builtin operations. See commit r280800 and https://bugs.llvm.org/show_bug.cgi?id=30219. This change, while being conservative on non-builtin functions, should set the type of expressions invoking builtins to the proper type, instead of defaulting to `bool` and requiring manual overrides in Sema::CheckBuiltinFunctionCall. In addition to tests for enqueue_kernel, the tests are extended to check other OpenCL builtins. Reviewers: Anastasia, spatel, rsmith Reviewed By: Anastasia Subscribers: kristina, cfe-commits, svenvh Differential Revision: https://reviews.llvm.org/D52879 llvm-svn: 347658
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