base: extend ImmediateCrashTest.ExpectedOpcodeSequence for mac arm64

This test needs a case for what clang does on Mac Arm64, so add that.

Bug: 1128436,1121871
Change-Id: I5d57f99f7d041bc91d9fc862c1d10ddc1b48f540
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412552
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807243}

base/immediate_crash_unittest.cc

@@ -150,6 +150,13 @@ TEST(ImmediateCrashTest, ExpectedOpcodeSequence) {
     // BRK #1
     EXPECT_EQ(0XD4200020, *++it);
 
+#elif defined(OS_MAC)
+
+    // BRK #1
+    EXPECT_EQ(0XD4200020, *++it);
+    // BRK #0
+    EXPECT_EQ(0XD4200000, *++it);
+
 #else
 
     // BRK #0