Attempting to prefer llvm-dwp over gnu's dwp

lldb/packages/Python/lldbsuite/test/make/Makefile.rules

@@ -364,7 +364,17 @@ ifneq "$(OS)" "Darwin"
 
 	OBJCOPY ?= $(call replace_cc_with,objcopy)
 	ARCHIVER ?= $(call replace_cc_with,ar)
-	DWP ?= $(call replace_cc_with,dwp)
+	# Look for llvm-dwp or gnu dwp
+	DWP ?= $(call replace_cc_with,llvm-dwp)
+	ifeq ($(wildcard $(DWP)),)
+		DWP = $(call replace_cc_with,dwp)
+		ifeq ($(wildcard $(DWP)),)
+			DWP = $(shell command -v llvm-dwp 2> /dev/null)
+			ifeq ($(wildcard $(DWP)),)
+				DWP = $(shell command -v dwp 2> /dev/null)
+			endif
+		endif
+	endif
 	override AR = $(ARCHIVER)
 endif
 
@@ -629,9 +639,9 @@ endif
 else
 	$(LD) $(DYLIB_OBJECTS) $(LDFLAGS) -shared -o "$(DYLIB_FILENAME)"
 ifeq "$(SPLIT_DEBUG_SYMBOLS)" "YES"
-	ifeq "$(SAVE_FULL_DEBUG_BINARY)" "YES"
+ifeq "$(SAVE_FULL_DEBUG_BINARY)" "YES"
 	cp "$(DYLIB_FILENAME)" "$(DYLIB_FILENAME).unstripped"
-	endif
+endif
 	$(OBJCOPY) --only-keep-debug "$(DYLIB_FILENAME)" "$(DYLIB_FILENAME).debug"
 	$(OBJCOPY) --strip-debug --add-gnu-debuglink="$(DYLIB_FILENAME).debug" "$(DYLIB_FILENAME)" "$(DYLIB_FILENAME)"
 endif