[NFC] Remove obsolete LLVM_GNUC_PREREQ
authorJF Bastien <jfbastien@apple.com>
Thu, 1 Aug 2019 03:30:45 +0000 (03:30 +0000)
committerJF Bastien <jfbastien@apple.com>
Thu, 1 Aug 2019 03:30:45 +0000 (03:30 +0000)
commit4e3e54ab72ad6a92dfe1b4d8cd525a38df27b2d9
treec24203150220911c111b6e98721d51b819992182
parentda5b9bfa95f5c415837772e11bdd33a9c20f37cd
[NFC] Remove obsolete LLVM_GNUC_PREREQ

The current minimum GCC version is 4.8 (soon to be 5.1), we there don't need to check for older versions. While I'm around Compiler.h, also update some of the doxygen comment.

llvm-svn: 367508
llvm/include/llvm/Support/Compiler.h
llvm/include/llvm/Support/MathExtras.h
llvm/include/llvm/Support/SwapByteOrder.h
llvm/include/llvm/Support/type_traits.h