[CrashReproducer] Upstream a test for -index-store-path support.

Patch by Bruno Cardoso Lopes.

test/Modules/crash-index-store-path.m

@@ -0,0 +1,38 @@
+// REQUIRES: crash-recovery, shell, system-darwin
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t/m
+
+// RUN: not env FORCE_CLANG_DIAGNOSTICS_CRASH= TMPDIR=%t TEMP=%t TMP=%t \
+// RUN: %clang -fsyntax-only %s -index-store-path %t/index \
+// RUN:     -fmodules -fmodules-cache-path=%t/m/ 2>&1 \
+// RUN:     | FileCheck --check-prefix=CHECKMOD %s
+// RUN: FileCheck --check-prefix=CHECKMOD_SH %s -input-file %t/crash-index-*.sh
+
+// RUN: rm -rf %t
+// RUN: not env FORCE_CLANG_DIAGNOSTICS_CRASH= TMPDIR=%t TEMP=%t TMP=%t \
+// RUN: %clang -fsyntax-only %s -index-store-path %t/index \
+// RUN:     2>&1 | FileCheck --check-prefix=CHECK %s
+// RUN: FileCheck --check-prefix=CHECKSH %s -input-file %t/crash-index-*.sh
+int foo() { return 0; }
+
+// CHECKMOD: Preprocessed source(s) and associated run script(s) are located at:
+// CHECKMOD-NEXT: note: diagnostic msg: {{.*}}.m
+// CHECKMOD-NEXT: note: diagnostic msg: {{.*}}.cache
+
+// CHECKMOD_SH: # Crash reproducer
+// CHECKMOD_SH-NEXT: # Driver args: "-fsyntax-only"
+// CHECKMOD_SH-NEXT: # Original command: {{.*$}}
+// CHECKMOD_SH-NEXT: "-cc1"
+// CHECKMOD_SH: "crash-index-{{[^ ]*}}.m"
+// CHECKMOD_SH: "-index-store-path" "crash-index-{{[^ ]*}}.cache/index-store"
+
+// CHECK: Preprocessed source(s) and associated run script(s) are located at:
+// CHECK-NEXT: note: diagnostic msg: {{.*}}.m
+
+// CHECKSH: # Crash reproducer
+// CHECKSH-NEXT: # Driver args: "-fsyntax-only"
+// CHECKSH-NEXT: # Original command: {{.*$}}
+// CHECKSH-NEXT: "-cc1"
+// CHECKSH: "crash-index-{{[^ ]*}}.m"
+// CHECKSH: "-index-store-path" "index-store"