tree edb25eb18838ba84de87480ea1255013b18c35d2
parent 220415ddfb59d16c9309e5bae37bed3be0943a25
author Protobuf Team Bot <protobuf-github-bot@google.com> 1702620981 -0800
committer Copybara-Service <copybara-worker@google.com> 1702621228 -0800

Avoid interface calls in hot loop

Before, every charAt would emit (on android):
```
    0x00002104    adrp x17, #+0x1000 (addr 0x3000)
    0x00002108    ldr w17, [x17, #20]
    0x0000210c    ldr x0, [x0, #128]
    0x00002110    ldr x0, [x0, #328]
    0x00002114    ldr lr, [x0, #24]
    0x00002118    blr lr <-- Call into String.charAt(int)
```
Now, it emits the inlined implementation of charAt (branch is for possibly compressed strings):
```
    0x000020b4    ldur w16, [x4, #-8]
    0x000020b8    tbnz w16, #0, #+0xc (addr 0x20c4)
    0x000020bc    ldrb w4, [x4, x0]
    0x000020c0    b #+0x8 (addr 0x20c8)
    0x000020c4    ldrh w4, [x4, x0, lsl #1]
```

PiperOrigin-RevId: 591147406