[cleanup] Drop handwritten KeyedStoreIC code

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index f8d79463a7f0b3d5b6d0f2c4ae89919cb1cfd18c..c9c125b950f30cdd34495b32ee7683211f34f367 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1804,9 +1804,7 @@ v8_source_set("v8_base") {
       "src/ia32/simulator-ia32.h",
       "src/ic/ia32/access-compiler-ia32.cc",
       "src/ic/ia32/handler-compiler-ia32.cc",
-      "src/ic/ia32/ic-compiler-ia32.cc",
       "src/ic/ia32/ic-ia32.cc",
-      "src/ic/ia32/stub-cache-ia32.cc",
       "src/regexp/ia32/regexp-macro-assembler-ia32.cc",
       "src/regexp/ia32/regexp-macro-assembler-ia32.h",
     ]
@@ -1829,9 +1827,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/x64/full-codegen-x64.cc",
       "src/ic/x64/access-compiler-x64.cc",
       "src/ic/x64/handler-compiler-x64.cc",
-      "src/ic/x64/ic-compiler-x64.cc",
       "src/ic/x64/ic-x64.cc",
-      "src/ic/x64/stub-cache-x64.cc",
       "src/regexp/x64/regexp-macro-assembler-x64.cc",
       "src/regexp/x64/regexp-macro-assembler-x64.h",
       "src/third_party/valgrind/valgrind.h",
@@ -1896,8 +1892,6 @@ v8_source_set("v8_base") {
       "src/ic/arm/access-compiler-arm.cc",
       "src/ic/arm/handler-compiler-arm.cc",
       "src/ic/arm/ic-arm.cc",
-      "src/ic/arm/ic-compiler-arm.cc",
-      "src/ic/arm/stub-cache-arm.cc",
       "src/regexp/arm/regexp-macro-assembler-arm.cc",
       "src/regexp/arm/regexp-macro-assembler-arm.h",
     ]
@@ -1955,8 +1949,6 @@ v8_source_set("v8_base") {
       "src/ic/arm64/access-compiler-arm64.cc",
       "src/ic/arm64/handler-compiler-arm64.cc",
       "src/ic/arm64/ic-arm64.cc",
-      "src/ic/arm64/ic-compiler-arm64.cc",
-      "src/ic/arm64/stub-cache-arm64.cc",
       "src/regexp/arm64/regexp-macro-assembler-arm64.cc",
       "src/regexp/arm64/regexp-macro-assembler-arm64.h",
     ]
@@ -1977,9 +1969,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/mips/full-codegen-mips.cc",
       "src/ic/mips/access-compiler-mips.cc",
       "src/ic/mips/handler-compiler-mips.cc",
-      "src/ic/mips/ic-compiler-mips.cc",
       "src/ic/mips/ic-mips.cc",
-      "src/ic/mips/stub-cache-mips.cc",
       "src/mips/assembler-mips-inl.h",
       "src/mips/assembler-mips.cc",
       "src/mips/assembler-mips.h",
@@ -2019,9 +2009,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/mips64/full-codegen-mips64.cc",
       "src/ic/mips64/access-compiler-mips64.cc",
       "src/ic/mips64/handler-compiler-mips64.cc",
-      "src/ic/mips64/ic-compiler-mips64.cc",
       "src/ic/mips64/ic-mips64.cc",
-      "src/ic/mips64/stub-cache-mips64.cc",
       "src/mips64/assembler-mips64-inl.h",
       "src/mips64/assembler-mips64.cc",
       "src/mips64/assembler-mips64.h",
@@ -2061,9 +2049,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/ppc/full-codegen-ppc.cc",
       "src/ic/ppc/access-compiler-ppc.cc",
       "src/ic/ppc/handler-compiler-ppc.cc",
-      "src/ic/ppc/ic-compiler-ppc.cc",
       "src/ic/ppc/ic-ppc.cc",
-      "src/ic/ppc/stub-cache-ppc.cc",
       "src/ppc/assembler-ppc-inl.h",
       "src/ppc/assembler-ppc.cc",
       "src/ppc/assembler-ppc.h",
@@ -2103,9 +2089,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/s390/full-codegen-s390.cc",
       "src/ic/s390/access-compiler-s390.cc",
       "src/ic/s390/handler-compiler-s390.cc",
-      "src/ic/s390/ic-compiler-s390.cc",
       "src/ic/s390/ic-s390.cc",
-      "src/ic/s390/stub-cache-s390.cc",
       "src/regexp/s390/regexp-macro-assembler-s390.cc",
       "src/regexp/s390/regexp-macro-assembler-s390.h",
       "src/s390/assembler-s390-inl.h",
@@ -2145,9 +2129,7 @@ v8_source_set("v8_base") {
       "src/full-codegen/x87/full-codegen-x87.cc",
       "src/ic/x87/access-compiler-x87.cc",
       "src/ic/x87/handler-compiler-x87.cc",
-      "src/ic/x87/ic-compiler-x87.cc",
       "src/ic/x87/ic-x87.cc",
-      "src/ic/x87/stub-cache-x87.cc",
       "src/regexp/x87/regexp-macro-assembler-x87.cc",
       "src/regexp/x87/regexp-macro-assembler-x87.h",
       "src/x87/assembler-x87-inl.h",