[UBSan] Enable builtin and bounds checks.

Bounds was previously disabled due to an UBSan bug that caused problems in yasm, but this no longer reproduces.

Change-Id: I3e06cea5ce51ff44ecc2171c05ceea29a40ec83b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906905
Commit-Queue: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714357}

build/config/sanitizers/BUILD.gn

@@ -486,9 +486,9 @@ config("ubsan_flags") {
           rebase_path("//tools/ubsan/blacklist.txt", root_build_dir)
     }
     cflags += [
-      # Yasm dies with an "Illegal instruction" error when bounds checking is
-      # enabled. See http://crbug.com/489901
-      # "-fsanitize=bounds",
+      "-fsanitize=bool",
+      "-fsanitize=bounds",
+      "-fsanitize=builtin",
       "-fsanitize=float-divide-by-zero",
       "-fsanitize=integer-divide-by-zero",
       "-fsanitize=null",
@@ -500,7 +500,6 @@ config("ubsan_flags") {
       "-fsanitize=signed-integer-overflow",
       "-fsanitize=unreachable",
       "-fsanitize=vla-bound",
-      "-fsanitize=bool",
       "-fsanitize-blacklist=$ubsan_blacklist_path",
     ]