target/mips: Extract nanoMIPS ISA translation routines

Extract 4900 lines from the huge translate.c to a new file,
'nanomips_translate.c.inc'. As there are too many inter-
dependencies we don't compile it as another object, but
keep including it in the big translate.o. We gain in code
maintainability.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201120210844.2625602-13-f4bug@amsat.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index cfbf7ef..c663dfe 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -246,6 +246,7 @@
 MIPS TCG CPUs (nanoMIPS ISA)
 S: Orphan
 F: disas/nanomips.*
+F: target/mips/tcg/*nanomips*
 
 NiosII TCG CPUs
 M: Chris Wulff <crwulff@gmail.com>