Fix most of LLVM's tests with LLVM_ENABLE_PIC=OFF

Lots of tests rely on llvm-lto being present, but LLVM_ENABLE_PIC=OFF currently
disables building that executable.

There's no reason for not building llvm-lto with LLVM_ENABLE_PIC=OFF so just
build it. r191042 moved it into a "if (!WIN)" block at the time, and then
211852 made that "if(NOT CYGWIN AND LLVM_ENABLE_PIC)" -- but that's only needed
for LTO (the ld64 plugin), not for the llvm-lto binary.

Differential Revision: https://reviews.llvm.org/D56801


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351374 91177308-0d34-0410-b5e6-96231b3b80d8

tools/CMakeLists.txt

@@ -27,7 +27,6 @@ endif()
 
 if(CYGWIN OR NOT LLVM_ENABLE_PIC)
   set(LLVM_TOOL_LTO_BUILD Off)
-  set(LLVM_TOOL_LLVM_LTO_BUILD Off)
 endif()
 
 # Add LTO, llvm-ar, llvm-config, and llvm-profdata before clang, ExternalProject