Fix cfi-icall failure with use_system_libjpeg=true

JPEGImageReader::AllocateSampleArray() can call the function pointer
(*info_.mem->alloc_sarray) which can be set by the systems non-CFI
enabled libjpeg DSO when chromium is built with use_system_libjpeg=true.
Disable cfi-icall for that method.

Bug: 866290
Change-Id: I6d9bbf08c514d6d5f48ad34c3802c63419ed1223
Reviewed-on: https://chromium-review.googlesource.com/1155927Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579270}

third_party/blink/renderer/platform/image-decoders/jpeg/jpeg_image_decoder.cc

@@ -643,7 +643,7 @@ class JPEGImageReader final {
   IntSize UvSize() const { return uv_size_; }
 
  private:
-  JSAMPARRAY AllocateSampleArray() {
+  NO_SANITIZE_CFI_ICALL JSAMPARRAY AllocateSampleArray() {
 // Some output color spaces don't need the sample array: don't allocate in that
 // case.
 #if defined(TURBO_JPEG_RGB_SWIZZLE)

third_party/blink/renderer/platform/wtf/compiler.h

@@ -57,8 +57,10 @@
 #if defined(__clang__)
 #define NO_SANITIZE_UNRELATED_CAST \
   __attribute__((no_sanitize("cfi-unrelated-cast", "vptr")))
+#define NO_SANITIZE_CFI_ICALL __attribute__((no_sanitize("cfi-icall")))
 #else
 #define NO_SANITIZE_UNRELATED_CAST
+#define NO_SANITIZE_CFI_ICALL
 #endif
 
 #endif /* WTF_Compiler_h */