[AArch64] Add more CPUs to host detection

[kongyi]

Summary

Returns "cortex-a73" for 3rd and 4th gen Kryo; not precisely correct, but close enough.

[efriedma]

LGTM

llvm/lib/Support/Host.cpp

for (unsigned I = 0, E = Lines.size(); I != E; ++I)
             .Case("0xc20", "cortex-m0")
             .Case("0xc23", "cortex-m3")
             .Case("0xc24", "cortex-m4")
             .Case("0xd04", "cortex-a35")
             .Case("0xd03", "cortex-a53")
             .Case("0xd07", "cortex-a57")
             .Case("0xd08", "cortex-a72")
             .Case("0xd09", "cortex-a73")
+            .Case("0xd0a", "cortex-a75")
+            .Case("0xd0b", "cortex-a76")
             .Default("generic");
   }
 
   if (Implementer == "0x42" || Implementer == "0x43") { // Broadcom | Cavium.
     for (unsigned I = 0, E = Lines.size(); I != E; ++I) {
       if (Lines[I].startswith("CPU part")) {
         return StringSwitch<const char *>(Lines[I].substr(8).ltrim("\t :"))
           .Case("0x516", "thunderx2t99")
for (unsigned I = 0, E = Lines.size(); I != E; ++I)
         // contents are specified in the various processor manuals.
         return StringSwitch<const char *>(Lines[I].substr(8).ltrim("\t :"))
             .Case("0x06f", "krait") // APQ8064
             .Case("0x201", "kryo")
             .Case("0x205", "kryo")
             .Case("0x211", "kryo")
             .Case("0x800", "cortex-a73")
             .Case("0x801", "cortex-a73")
+            .Case("0x802", "cortex-a73")
+            .Case("0x803", "cortex-a73")
+            .Case("0x804", "cortex-a73")
+            .Case("0x805", "cortex-a73")
             .Case("0xc00", "falkor")
             .Case("0xc01", "saphira")
             .Default("generic");
 
   if (Implementer == "0x53") { // Samsung Electronics Co., Ltd.
     // The Exynos chips have a convoluted ID scheme that doesn't seem to follow
     // any predictive pattern across variants and parts.
     unsigned Variant = 0, Part = 0;