[clang][ARM] Remove non-existent arm9312 CPU

[DavidSpickett]

Summary

I cannot find documentation on this CPU, and it
is not supported by the Arm Compiler 5 product either.

It was likely a mistake or a different name for the
"ep9312", which is an Arm based Cirrus Logic chip.

[peter.smith]

I can confirm that there is no Arm produced 9312. In the Arm 9 range the CPU names used 3 digits, for example arm926 with the exception of arm9tdmi and arm9e.

llvm/include/llvm/Support/ARMTargetParser.def

 ARM_CPU_NAME("arm7tdmi-s", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm710t", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm720t", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm9", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm9tdmi", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm920", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm920t", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm922t", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
-ARM_CPU_NAME("arm9312", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm940t", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("ep9312", ARMV4T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm10tdmi", ARMV5T, FK_NONE, true, ARM::AEK_NONE)
 ARM_CPU_NAME("arm1020t", ARMV5T, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm9e", ARMV5TE, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm946e-s", ARMV5TE, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm966e-s", ARMV5TE, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("arm968e-s", ARMV5TE, FK_NONE, false, ARM::AEK_NONE)

llvm/unittests/Support/TargetParserTest.cpp

::testing::Values(
         ARMCPUTestParams("arm7tdmi-s", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm710t", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm720t", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm9", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm9tdmi", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm920", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm920t", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm922t", "armv4t", "none", ARM::AEK_NONE, "4T"),
-        ARMCPUTestParams("arm9312", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm940t", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("ep9312", "armv4t", "none", ARM::AEK_NONE, "4T"),
         ARMCPUTestParams("arm10tdmi", "armv5t", "none", ARM::AEK_NONE, "5T"),
         ARMCPUTestParams("arm1020t", "armv5t", "none", ARM::AEK_NONE, "5T"),
         ARMCPUTestParams("arm9e", "armv5te", "none",
                          ARM::AEK_NONE | ARM::AEK_DSP, "5TE"),
         ARMCPUTestParams("arm946e-s", "armv5te", "none",
                          ARM::AEK_NONE | ARM::AEK_DSP, "5TE"),
::testing::Values(
                              ARM::AEK_FP16,
                          "8.1-M.Mainline"),
         ARMCPUTestParams("iwmmxt", "iwmmxt", "none", ARM::AEK_NONE, "iwmmxt"),
         ARMCPUTestParams("xscale", "xscale", "none", ARM::AEK_NONE, "xscale"),
         ARMCPUTestParams("swift", "armv7s", "neon-vfpv4",
                          ARM::AEK_HWDIVARM | ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP,
                          "7-S")));
 
-static constexpr unsigned NumARMCPUArchs = 91;
+static constexpr unsigned NumARMCPUArchs = 90;
 
 TEST(TargetParserTest, testARMCPUArchList) {
   SmallVector<StringRef, NumARMCPUArchs> List;
   ARM::fillValidCPUArchList(List);
 
   // No list exists for these in this test suite, so ensure all are
   // valid, and match the expected 'magic' count.
   EXPECT_EQ(List.size(), NumARMCPUArchs);