Enable use of __builtin_assume_aligned when self-hosting

Clang/LLVM trunk now have support for __builtin_assume_aligned, turn this &&
into an || so we can use it ourselves.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217545 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Compiler.h

@@ -284,7 +284,7 @@
 
 /// \macro LLVM_ASSUME_ALIGNED
 /// \brief Returns a pointer with an assumed alignment.
-#if __has_builtin(__builtin_assume_aligned) && __GNUC_PREREQ(4, 7)
+#if __has_builtin(__builtin_assume_aligned) || __GNUC_PREREQ(4, 7)
 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
 #elif defined(LLVM_BUILTIN_UNREACHABLE)
 // As of today, clang does not support __builtin_assume_aligned.