[profile] Rename InstrProfilingPlatform(Linux|Darwin)

[phosek]

Summary

Rename InstrProfilingPlatform(Linux|Darwin) to
InstrProfilingPlatform(ELF|MachO) since these files are more
specific to linker and file format than OS.

[davidxl]

lgtm

compiler-rt/lib/profile/CMakeLists.txt

set(PROFILE_SOURCES
   InstrProfiling.c
   InstrProfilingValue.c
   InstrProfilingBuffer.c
   InstrProfilingFile.c
   InstrProfilingMerge.c
   InstrProfilingMergeFile.c
   InstrProfilingNameVar.c
   InstrProfilingWriter.c
-  InstrProfilingPlatformDarwin.c
-  InstrProfilingPlatformLinux.c
+  InstrProfilingPlatformELF.c
+  InstrProfilingPlatformMachO.c
   InstrProfilingPlatformOther.c
   InstrProfilingRuntime.cc
   InstrProfilingUtil.c)
 
 if(WIN32)
     list(APPEND PROFILE_SOURCES WindowsMMap.c)
 endif()
 

compiler-rt/lib/profile/InstrProfilingPlatformELF.c

-/*===- InstrProfilingPlatformLinux.c - Profile data Linux platform ------===*\
+/*===- InstrProfilingPlatformELF.c - Profile data for ELF platform --------===*\
 |*
 |*                     The LLVM Compiler Infrastructure
 |*
 |* This file is distributed under the University of Illinois Open Source
 |* License. See LICENSE.TXT for details.
 |*
 \*===----------------------------------------------------------------------===*/
 

compiler-rt/lib/profile/InstrProfilingPlatformMachO.c

-/*===- InstrProfilingPlatformDarwin.c - Profile data on Darwin ------------===*\
+/*===- InstrProfilingPlatformMachO.c - Profile data for MachO platform ----===*\
 |*
 |*                     The LLVM Compiler Infrastructure
 |*
 |* This file is distributed under the University of Illinois Open Source
 |* License. See LICENSE.TXT for details.
 |*
 \*===----------------------------------------------------------------------===*/