[libc][math] correct the output of `asinpif` and `acospi` (#185544)
Currently, we have accuracy issues and some points fail in the asinpif
exhaustive test. This change fixes it by increasing the degree of the
used polynomial
```
-- Testing for FE_TONEAREST in range [0x0, 0x7f800000) --
Failed to match Func(x) against LIBC_NAMESPACE::testing::mpfr::get_mpfr_matcher<Op>( x, Func(x), 0.5, rounding).
Match value not within tolerance value of MPFR result:
Input decimal: 0.00000011348398487598387873731553554534912109375000
Input bits: 0x33F3B47B = (S: 0, E: 0x0067, M: 0x0073B47B)
Match decimal: 0.00000003612307253320068411994725465774536132812500
Match bits: 0x331B25BD = (S: 0, E: 0x0066, M: 0x001B25BD)
MPFR result: 0.00000003612307608591436292044818401336669921875000
MPFR rounded: 0x331B25BE = (S: 0, E: 0x0066, M: 0x001B25BE)
ULP error: 1.00000000000000000000000000000000000000000000000000
Test failed for 1 inputs in range: 871366656 to 872415232 [0x33f00000, 0x34000000), [0x1.ep-24, 0x1p-23)
Match value not within tolerance value of MPFR result:
Input decimal: 0.00000356030955117603298276662826538085937500000000
Input bits: 0x366EEDA7 = (S: 0, E: 0x006C, M: 0x006EEDA7)
Match decimal: 0.00000113328167117288103327155113220214843750000000
Match bits: 0x35981B43 = (S: 0, E: 0x006B, M: 0x00181B43)
MPFR result: 0.00000113328178485971875488758087158203125000000000
MPFR rounded: 0x35981B44 = (S: 0, E: 0x006B, M: 0x00181B44)
ULP error: 1.00000000000000000000000000000000000000000000000000
Test failed for 1 inputs in range: 912261120 to 913309696 [0x36600000, 0x36700000), [0x1.cp-19, 0x1.ep-19)
Match value not within tolerance value of MPFR result:
Input decimal: -0.00000011348398487598387873731553554534912109375000
Input bits: 0xB3F3B47B = (S: 1, E: 0x0067, M: 0x0073B47B)
Match decimal: -0.00000003612307253320068411994725465774536132812500
Match bits: 0xB31B25BD = (S: 1, E: 0x0066, M: 0x001B25BD)
MPFR result: -0.00000003612307608591436292044818401336669921875000
MPFR rounded: 0xB31B25BE = (S: 1, E: 0x0066, M: 0x001B25BE)
ULP error: 1.00000000000000000000000000000000000000000000000000
Test failed for 1 inputs in range: 3018850304 to 3019898880 [0xb3f00000, 0xb4000000), [-0x1.ep-24, -0x1p-23)
Match value not within tolerance value of MPFR result:
Input decimal: -0.00000356030955117603298276662826538085937500000000
Input bits: 0xB66EEDA7 = (S: 1, E: 0x006C, M: 0x006EEDA7)
Match decimal: -0.00000113328167117288103327155113220214843750000000
Match bits: 0xB5981B43 = (S: 1, E: 0x006B, M: 0x00181B43)
MPFR result: -0.00000113328178485971875488758087158203125000000000
MPFR rounded: 0xB5981B44 = (S: 1, E: 0x006B, M: 0x00181B44)
ULP error: 1.00000000000000000000000000000000000000000000000000
Test failed for 1 inputs in range: 3059744768 to 3060793344 [0xb6600000, 0xb6700000), [-0x1.cp-19, -0x1.ep-19)
```
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