gc, 8g, 8l: fix a handful of warnings

8g/cgen.c
        print format type mismatch

8l/asm.c
        resoff set and not used

gc/pgen.c
        misleading comparison INT > 0x80000000

gc/reflect.c
        dalgsym must be static to match forward declaration

gc/subr.c
        assumed_equal set and not used
        hashmem's second argument is not used

gc/walk.c
        duplicated (unreachable) code

R=rsc
CC=golang-dev
https://golang.org/cl/5651079

1 files changed, 3 insertions, 0 deletions

diff --git a/src/cmd/8l/asm.c b/src/cmd/8l/asm.c
index dcaa0b192b..54bda1ac84 100644
--- a/src/cmd/8l/asm.c
+++ b/src/cmd/8l/asm.c
@@ -1004,6 +1004,9 @@ asmb(void)
 			phsh(ph, sh);
 		}
 
+		// Additions to the reserved area must be above this line.
+		USED(resoff);
+
 		elfphload(&segtext);
 		elfphload(&segdata);