loongarch32 build failure on 32-bit host

[Alan Modra]

gas/config/tc-loongarch.c: In function ‘assember_macro_helper’:
gas/config/tc-loongarch.c:915:28: error: right shift count >= width of type [-Werror=shift-count-overflow]
  915 |       hi32 = insn->args[1] >> 32;
      |                            ^~

One possible fix is to make offsetT a 64-bit type for loongarch32.
This also makes bfd/targmatch.h (generated from bfd/config.bfd)
consistent since the loongarch32 match is inside #ifdef BFD64.

	* config.bfd (loongarch32-*): Set want64.

diff --git a/bfd/config.bfd b/bfd/config.bfd
index 776918253ef..08755e4679b 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -1463,7 +1463,7 @@ case "${targ}" in
   loongarch32-*)
     targ_defvec=loongarch_elf32_vec
     targ_selvecs="loongarch_elf32_vec"
-    want64=false
+    want64=true
     ;;
 
   loongarch64-*)

-- 
Alan Modra
Australia Development Lab, IBM