Rollup merge of #145353 - CathalMullan:jemalloc-tools, r=Kobzol

bootstrap: Fix jemalloc 64K page support for aarch64 tools

Resolves rust-lang/rust#133748

The prior page size fix only targeted the compile build step, not the tools step: rust-lang/rust#135081

Also note that since `miri` always uses jemalloc, I didn't copy the `builder.config.jemalloc(target)` check to the tools section.

Tested by running `strings` on the compiled `miri` binary to see the LG_PAGE value.

Before:

```
> strings miri | grep '^LG_PAGE'
LG_PAGE 14
```

After:

```
> strings miri | grep '^LG_PAGE'
LG_PAGE 16
```

May also need a separate fix for the standalone miri repository: rust-lang/miri#4514 (likely a change needed in miri-script?)

Author: Kobzol