JIT

gh-75229: limit ensurepip prefix overrides to explicit requests #53

Job	Run time
Interpreter (Debug)	11m 16s
JIT with tail calling interpreter	3m 52s
x86_64-apple-darwin/clang (Debug)	46m 3s
Free-Threaded (Debug)	3m 31s
aarch64-unknown-linux-gnu/gcc (Release)	6m 24s
JIT without optimizations (Debug)	3m 44s
aarch64-apple-darwin/clang (Release)	15m 29s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 2s
x86_64-unknown-linux-gnu/gcc (Release)	8m 31s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 46s
i686-pc-windows-msvc/msvc (Release)	15m 56s
aarch64-apple-darwin/clang (Debug)	16m 5s
x86_64-pc-windows-msvc/msvc (Debug)	29m 31s
aarch64-pc-windows-msvc/msvc (Debug)	25m 23s
aarch64-pc-windows-msvc/msvc (Release)	21m 4s
i686-pc-windows-msvc/msvc (Debug)	21m 20s
x86_64-pc-windows-msvc/msvc (Release)	16m 15s
x86_64-apple-darwin/clang (Release)	31m 8s
	4h 55m 20s

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