MIPS32: Improve method invocation

Improvements include:
- CodeGeneratorMIPS::GenerateStaticOrDirectCall() supports:
  - MethodLoadKind::kDirectAddressWithFixup (via literals)
  - CodePtrLocation::kCallDirectWithFixup (via literals)
  - MethodLoadKind::kDexCachePcRelative
- 32-bit literals to support the above (not ready for general-
  purpose applications yet because RA is not saved in leaf
  methods, but is clobbered on MIPS32R2 when simulating
  PC-relative addressing (MIPS32R6 is OK because it has
  PC-relative addressing with the lwpc instruction))
- shorter instruction sequences for recursive static/direct
  calls

Tested:
- test-art-host-gtest
- test-art-target-gtest and test-art-target-run-test-optimizing on:
  - MIPS32R2 QEMU
  - CI20 board
  - MIPS32R6 (2nd arch) QEMU

Change-Id: Id5b137ad32d5590487fd154c9a01d3b3e7e044ff
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index e52dda3..474530a 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -394,7 +394,7 @@
       dump_passes_(dump_passes),
       timings_logger_(timer),
       compiler_context_(nullptr),
-      support_boot_image_fixup_(instruction_set != kMips && instruction_set != kMips64),
+      support_boot_image_fixup_(instruction_set != kMips64),
       dex_files_for_oat_file_(nullptr),
       compiled_method_storage_(swap_fd),
       profile_compilation_info_(profile_compilation_info),