message: Use the same module cache path for swift and clang.
diff: @@ -263,11 +263,6 @@ DEBUG_INFO_FLAG ?= -g
  CFLAGS ?= $(DEBUG_INFO_FLAG) -O0 -fno-builtin
  SWIFTFLAGS ?= -g -Onone -Xfrontend -serialize-debugging-options
  -# Setup a default per-user Swift module cache directory.
  -SWIFT_MODULE_CACHE_PATH ?= /tmp/lldbtest.swift.modulecache.$(USER)
  -SWIFT_MODULE_CACHE_FLAGS = -module-cache-path $(SWIFT_MODULE_CACHE_PATH)
  -SWIFTFLAGS += $(SWIFT_MODULE_CACHE_FLAGS)
  -
  ifneq (,$(findstring arm,$(ARCH)))
  SWIFTFLAGS += -static-stdlib
  endif
  @@ -301,6 +296,8 @@ ifeq "$(MAKE_DWO)" "YES"
  endif
  CLANG_MODULE_CACHE_DIR := $(BUILDDIR)/module-cache
  +SWIFT_MODULE_CACHE_FLAGS = -module-cache-path $(CLANG_MODULE_CACHE_DIR)
  +SWIFTFLAGS += $(SWIFT_MODULE_CACHE_FLAGS)
  MANDATORY_MODULE_BUILD_CFLAGS := -fmodules -gmodules -fmodules-cache-path=$(CLANG_MODULE_CACHE_DIR)
  