MIPS32: java.lang.String.getChars

Use memcpy(3) to copy characters under the assumption that memcpy()
has been hand optimized for best performance on the platform being
tested.

Test: run-test --optimizing 020-string
Test: run-test 020-string
Test: run-test --no-prebuild --optimizing 020-string
Test: run-test --no-prebuild 020-string
Test: run-test --optimizing 082-inline-execute
Test: run-test 082-inline-execute
Test: run-test --no-prebuild --optimizing 082-inline-execute
Test: run-test --no-prebuild 082-inline-execute
Test: mma -j2 ART_TEST_OPTIMIZING=true test-art-target-run-test
Test: booted MIPS32R2 emulator.

Note: Tested against both the MIPS32R2, and MIPS64R6 emulators.

Change-Id: I4192cf6244db120c8de5cc4932d4132acfc9740d
diff --git a/compiler/utils/mips/assembler_mips32r6_test.cc b/compiler/utils/mips/assembler_mips32r6_test.cc
index a52f519..30667ef 100644
--- a/compiler/utils/mips/assembler_mips32r6_test.cc
+++ b/compiler/utils/mips/assembler_mips32r6_test.cc
@@ -319,6 +319,14 @@
   DriverStr(RepeatRR(&mips::MipsAssembler::Bitswap, "bitswap ${reg1}, ${reg2}"), "bitswap");
 }
 
+TEST_F(AssemblerMIPS32r6Test, Lsa) {
+  DriverStr(RepeatRRRIb(&mips::MipsAssembler::Lsa,
+                        2,
+                        "lsa ${reg1}, ${reg2}, ${reg3}, {imm}",
+                        1),
+            "lsa");
+}
+
 TEST_F(AssemblerMIPS32r6Test, Seleqz) {
   DriverStr(RepeatRRR(&mips::MipsAssembler::Seleqz, "seleqz ${reg1}, ${reg2}, ${reg3}"),
             "seleqz");