More MIPS fixes. Many run-test tests pass.

Run-test tests 001-043 work, including 003-omnibus-opcodes. 044 is
proxy, which is still broken.

Changes made:
- Fixed argument marshalling of FP values for calls to helper functions
  in the compiler.
- Fixed CheckCast compilation's mistaken use of rARG0 instead of rRET0.
- Fixed conversion calls to marshall FP arguments properly.
- Created named values for FP args, though they differ in MIPS only.
- Fixed assembly to always use T9 to hold code pointer to jump to.
- Fixed proxy offset values.

Change-Id: If121db322683a307e5a1016210f4f73283aa817c
diff --git a/src/oat/runtime/mips/runtime_support_mips.S b/src/oat/runtime/mips/runtime_support_mips.S
index eafd380..349e802 100644
--- a/src/oat/runtime/mips/runtime_support_mips.S
+++ b/src/oat/runtime/mips/runtime_support_mips.S
@@ -353,11 +353,11 @@
     sw    $t0, 16($sp)                    # pass $sp
     addiu $sp, $sp, 16                    # release out args
     move  $a0, $v0                        # save target Method*
-    move  $t0, $v1                        # save $v0->code_
+    move  $t9, $v1                        # save $v0->code_
     RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
     beqz  $v0, 1f
     nop
-    jr    $t0
+    jr    $t9
     nop
 1:
     DELIVER_PENDING_EXCEPTION
@@ -389,13 +389,13 @@
     move     $a0, rSELF       # pass Thread::Current
     jal      artWorkAroundAppJniBugs  # (Thread*, $sp)
     move     $a1, $sp         # pass $sp
-    move     $t0, $v0         # save target address
+    move     $t9, $v0         # save target address
     lw       $a0, 12($sp)
     lw       $a1, 16($sp)
     lw       $a2, 20($sp)
     lw       $a3, 24($sp)
     lw       $ra, 28($sp)
-    jr       $t0              # tail call into JNI routine
+    jr       $t9              # tail call into JNI routine
     addiu    $sp, $sp, 32
 
     .global art_handle_fill_data_from_code