tsan: remove unnecessary enum values (NFC)

[dvyukov]

Summary

Remove unnecessary enum values in the memory profiler.
There is no point in spelling them, it can only lead to bugs
and larger diffs when values are added/removed.

compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp

 static void InitializeLongjmpXorKey();
 static uptr longjmp_xor_key;
 #endif
 
 // Runtime detected VMA size.
 uptr vmaSize;
 
 enum {
-  MemTotal  = 0,
-  MemShadow = 1,
-  MemMeta   = 2,
-  MemFile   = 3,
-  MemMmap   = 4,
-  MemTrace  = 5,
-  MemHeap   = 6,
-  MemOther  = 7,
-  MemCount  = 8,
+  MemTotal,
+  MemShadow,
+  MemMeta,
+  MemFile,
+  MemMmap,
+  MemTrace,
+  MemHeap,
+  MemOther,
+  MemCount,
 };
 
 void FillProfileCallback(uptr p, uptr rss, bool file,
                          uptr *mem, uptr stats_size) {
   mem[MemTotal] += rss;
   if (p >= ShadowBeg() && p < ShadowEnd())
     mem[MemShadow] += rss;
   else if (p >= MetaShadowBeg() && p < MetaShadowEnd())