[profile] Hide lprofCurFilename

[vsk]

Summary

Apple has a build verification step which complains when external symbols are introduced into a project, if they're not defined in some header. When building programs for profiling we need to expose VPMergeHook, _llvm_profile_filename, and __llvm_profile_raw_version so we've whitelisted these. I don't think we need to expose lprofCurFilename.

[davidxl]

lgtm

compiler-rt/trunk/lib/profile/InstrProfilingFile.c

typedef struct lprofFilename {
    * is not enabled, its value should be 0. This parameter is specified
    * by the %[0-9]m specifier. For instance %2m enables merging using
    * 2 profile data files. %1m is equivalent to %m. Also %m specifier
    * can only appear once at the end of the name pattern. */
   unsigned MergePoolSize;
   ProfileNameSpecifier PNS;
 } lprofFilename;
 
-lprofFilename lprofCurFilename = {0, 0, 0, {0}, {0}, 0, 0, 0, PNS_unknown};
+static lprofFilename lprofCurFilename = {0, 0, 0, {0}, {0},
+                                         0, 0, 0, PNS_unknown};
 
 int getpid(void);
 static int getCurFilenameLength();
 static const char *getCurFilename(char *FilenameBuf);
 static unsigned doMerging() { return lprofCurFilename.MergePoolSize; }
 
 /* Return 1 if there is an error, otherwise return  0.  */
 static uint32_t fileWriter(ProfDataIOVec *IOVecs, uint32_t NumIOVecs,