CFI: Add config to disable cfi-icall

Bug: 894423
Change-Id: I10e809b1b745f2c9d0fdcbf6bd1f958d1aec0103
Reviewed-on: https://chromium-review.googlesource.com/c/1283934Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600144}

build/config/sanitizers/BUILD.gn

@@ -390,6 +390,12 @@ config("cfi_icall_generalize_pointers") {
   }
 }
 
+config("cfi_icall_disable") {
+  if (is_clang && is_cfi && use_cfi_icall) {
+    cflags = [ "-fno-sanitize=cfi-icall" ]
+  }
+}
+
 config("coverage_flags") {
   cflags = []
   if (use_sanitizer_coverage) {