[llvm] MCInst: decrease inline element count to 6. NFC (PR #94913)

[Fangrui Song via llvm-commits]

MaskRay wrote:

https://llvm-compile-time-tracker.com/compare.php?from=f7ccb320859b9e341f74dc0cd7791a3b871eb937&to=ed52b7b350213ed3731109ac3c2a777f452df706&stat=max-rss

<h4 style="font-family: monospace; color: rgb(0, 0, 0); font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">clang build:</h4>
Metric | Old | New
-- | -- | --
max-rss | 2613MiB | 2594MiB (-0.73%)



https://github.com/llvm/llvm-project/pull/94913