[CMake][PowerPC] Recognize LLVM_NATIVE_TARGET="ppc64le" as PowerPC

Summary:
This value is derived from the host triple, which on the machine
I'm currently using is `ppc64le-linux-redhat`. This change makes
LLVM compile.

Reviewers: nemanjai
Differential Revision: https://reviews.llvm.org/D57118

llvm-svn: 359242

Author: Keno

llvm/cmake/config-ix.cmake

@@ -393,6 +393,8 @@ elseif (LLVM_NATIVE_ARCH MATCHES "sparc")
   set(LLVM_NATIVE_ARCH Sparc)
 elseif (LLVM_NATIVE_ARCH MATCHES "powerpc")
   set(LLVM_NATIVE_ARCH PowerPC)
+elseif (LLVM_NATIVE_ARCH MATCHES "ppc64le")
+  set(LLVM_NATIVE_ARCH PowerPC)
 elseif (LLVM_NATIVE_ARCH MATCHES "aarch64")
   set(LLVM_NATIVE_ARCH AArch64)
 elseif (LLVM_NATIVE_ARCH MATCHES "arm64")