microblaze: Control use of xilinx.ld based on -r switch

Change how we decide to use xilinx.ld. Add a check for the -r switch, using it
only when that switch is not present.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

gcc/config/microblaze/microblaze.h

@@ -115,7 +115,7 @@ extern enum pipeline_type microblaze_pipe;
   %{Zxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
   %{mxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
   %{mxl-gp-opt:%{G*}} %{!mxl-gp-opt: -G 0} \
-  %{!T*: %:if-exists-then-else(xilinx.ld%s -dT) %:if-exists(xilinx.ld%s)}"
+  %{!r:%{!T*: -dT xilinx.ld%s}}"
 
 /* Specs for the compiler proper  */