Commit 2d5d55a

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bootstrap: build std with less frame pointers

Sometimes leaf frame-pointers can impact LLVM inlining choices, and that can be a real problem for things like `mul_add`.

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Original file line number	Diff line number	Diff line change
`@@ -670,7 +670,8 @@ pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, car`
`670`	`670`
`671`	`671`	`// Enable frame pointers by default for the library. Note that they are still controlled by a`
`672`	`672`	`// separate setting for the compiler.`
`673`		`- cargo.rustflag("-Cforce-frame-pointers=yes");`
	`673`	`+ cargo.rustflag("-Zunstable-options");`
	`674`	`+ cargo.rustflag("-Cforce-frame-pointers=non-leaf");`
`674`	`675`
`675`	`676`	`let html_root =`
`676`	`677`	`format!("-Zcrate-attr=doc(html_root_url=\"{}/\")", builder.doc_rust_lang_org_channel(),);`

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