[clang] [Sparc][clang] Use 64-bit long double on bare-metal targets (PR #222304)

[Folkert de Vries via cfe-commits]

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+// RUN: %clang_cc1 -triple sparc-unknown-none -O1 -emit-llvm -o - %s | FileCheck %s
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folkertdev wrote:

this should have more revisions right? at least also `sparc-unknown-linux-gnu`

https://github.com/llvm/llvm-project/pull/222304