Initial switch to Chromium-style CHECK_* and DCHECK_* macros.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index baa2076344fe1a90a97d3dfac3f6efb80b23e99f..ff1c6f45acf64fe1bbe1d7e65bd5a7d61e9049e4 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -91,7 +91,7 @@ bool OSHasAVXSupport() {
   // The buffer now contains a string of the form XX.YY.ZZ, where
   // XX is the major kernel version component.
   char* period_pos = strchr(buffer, '.');
-  DCHECK_NOT_NULL(period_pos);
+  DCHECK(period_pos);
   *period_pos = '\0';
   long kernel_version_major = strtol(buffer, nullptr, 10);  // NOLINT
   if (kernel_version_major <= 13) return false;