Revert 126715 - Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/stacktrace_x86-inl.h

Index: third_party/tcmalloc/vendor/src/stacktrace_x86-inl.h
===================================================================
--- third_party/tcmalloc/vendor/src/stacktrace_x86-inl.h	(revision 126727)
+++ third_party/tcmalloc/vendor/src/stacktrace_x86-inl.h	(working copy)
@@ -64,7 +64,7 @@
 #include "base/vdso_support.h"
 #endif
 
-#include "gperftools/stacktrace.h"
+#include "google/stacktrace.h"
 
 #if defined(__linux__) && defined(__i386__) && defined(__ELF__) && defined(HAVE_MMAP)
 // Count "push %reg" instructions in VDSO __kernel_vsyscall(),
@@ -238,14 +238,9 @@
     // In the non-strict mode, allow discontiguous stack frames.
     // (alternate-signal-stacks for example).
     if (new_sp == old_sp) return NULL;
-    if (new_sp > old_sp) {
-      // And allow frames upto about 1MB.
-      const uintptr_t delta = (uintptr_t)new_sp - (uintptr_t)old_sp;
-      const uintptr_t acceptable_delta = 1000000;
-      if (delta > acceptable_delta) {
-        return NULL;
-      }
-    }
+    // And allow frames upto about 1MB.
+    if ((new_sp > old_sp)
+        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL;
   }
   if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL;
 #ifdef __i386__