Some patches for Figma

* ignore some clang flags used by XCode (e.g. `--index-sort-path`)
* Disable `FPContract` which produces different floating-point results in
  macOS builds.
* Add missing include: "sanitizer_interface_internal.h"
* Use `isnan` instead of `std::isnan` because Apple Clang doesn't seem to
  compile properly otherwise.

clang/include/clang/Driver/Options.td

@@ -627,6 +627,14 @@ def : Joined<["-"], "objcmt-whitelist-dir-path=">, Flags<[CC1Option]>,
 def : Joined<["-"], "objcmt-white-list-dir-path=">, Flags<[CC1Option]>,
   Alias<objcmt_allowlist_dir_path>;
 
+// FIGMA
+def index_store_path : Separate<["-"], "index-store-path">, Flags<[CC1Option, NoArgumentUnused]>;
+def index_ignore_system_symbols : Flag<["-"], "index-ignore-system-symbols">, Flags<[CC1Option, NoArgumentUnused]>;
+def index_record_codegen_name : Flag<["-"], "index-record-codegen-name">, Flags<[CC1Option, NoArgumentUnused]>;
+def index_unit_output_path : Separate<["-"], "index-unit-output-path">, MetaVarName<"<path>">, Flags<[CC1Option, NoArgumentUnused]>;
+def index_ignore_macros : Flag<["-"], "index-ignore-macros">, Flags<[CC1Option, NoArgumentUnused]>;
+// FIGMA
+
 // Make sure all other -ccc- options are rejected.
 def ccc_ : Joined<["-"], "ccc-">, Group<internal_Group>, Flags<[Unsupported]>;
 

clang/lib/Driver/ToolChains/Clang.cpp

@@ -2732,6 +2732,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
   if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
       !JA.isOffloading(Action::OFK_HIP))
     FPContract = "on";
+  /* FIGMA */ FPContract = "off";
   bool StrictFPModel = false;
 
   if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {

compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp

@@ -25,6 +25,7 @@
 #include "sanitizer_common.h"
 #include "sanitizer_file.h"
 #include "sanitizer_flags.h"
+#include "sanitizer_interface_internal.h"
 #include "sanitizer_internal_defs.h"
 #include "sanitizer_libc.h"
 #include "sanitizer_platform_limits_posix.h"

lldb/source/Core/DumpDataExtractor.cpp

@@ -241,14 +241,14 @@ void DumpFloatingPoint(std::ostringstream &ss, FloatT f) {
   // NaN and Inf are potentially implementation defined and on Darwin it
   // seems NaNs are printed without their sign. Manually implement dumping them
   // here to avoid having to deal with platform differences.
-  if (std::isnan(f)) {
-    if (std::signbit(f))
+  if (isnan(f)) {   // FIGMA
+    if (signbit(f)) // FIGMA
       ss << '-';
     ss << "nan";
     return;
   }
-  if (std::isinf(f)) {
-    if (std::signbit(f))
+  if (isinf(f)) {   // FIGMA
+    if (signbit(f)) // FIGMA
       ss << '-';
     ss << "inf";
     return;