[BUG] Compile time float pow crashes

[thatstoasty]

Bug description

Unable to use floats for an exponent operation at compile time.

Steps to reproduce

Reproduction example:

alias num = 1.23 ** 4.56

fn main():
    print(num)

open-source/mojo/stdlib/stdlib/builtin/_startup.mojo:114:4: error: call expansion failed
open-source/mojo/stdlib/stdlib/builtin/_startup.mojo:45:4: note: function instantiation failed
<unknown>:0: note: failed to compile-time evaluate function call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:851:8: note: failed to interpret function @stdlib::builtin::simd::SIMD::__pow__(::SIMD[$0, $1],::SIMD[$0, $1]),type=f64,size=1
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:862:20: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:2996:4: note: failed to interpret function @stdlib::builtin::simd::_pow[::Int,::DType,::DType](::SIMD[$1, $0],::SIMD[$2, $0]),simd_width=1,type`=f64,type`1=f64
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:3015:21: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:3054:4: note: failed to interpret function @stdlib::builtin::simd::_powf[::Int,::DType,::DType](::SIMD[$1, $0],::SIMD[$2, $0]),simd_width=1,type`=f64,type`1=f64
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:3065:33: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:3035:4: note: failed to interpret function @stdlib::builtin::simd::_powf_scalar[::DType,::DType](::SIMD[$0, {1}],::SIMD[$1, {1}]),type`=f64,type`1=f64
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:3050:20: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/math/math.mojo:550:4: note: failed to interpret function @stdlib::math::math::exp[::DType,::Int](::SIMD[$0, $1]),type=f64,simd_width=1
open-source/mojo/stdlib/stdlib/math/math.mojo:65:27: note: call expansion failed
<unknown>:0:0: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:1590:8: note: failed to interpret function @stdlib::builtin::simd::SIMD::__floor__(::SIMD[$0, $1]),type=f64,size=1
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:1596:57: note: failed to evaluate call
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:1882:8: note: failed to interpret function @stdlib::builtin::simd::SIMD::_floor_ceil_trunc_impl[::StringLiteral](::SIMD[$0, $1]),type=f64,size=1,intrinsic="llvm.floor"
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:1902:74: note: call expansion failed
open-source/mojo/stdlib/stdlib/sys/intrinsics.mojo:90:14: note: failed to interpret operation pop.call_llvm_intrinsic{fastmathFlags: #pop<fmf none>, hasSideEffects: false, intrin: "llvm.floor" : !kgen.string}(#kgen.pack<"1.8618819175149959"> : !kgen.pack<[[typevalue<#kgen.typeref<@"stdlib::builtin::simd::SIMD,type=f64,size=1">>, scalar<f64>]]>)
open-source/mojo/stdlib/stdlib/builtin/simd.mojo:1902:74: note: call expansion failed
open-source/mojo/stdlib/stdlib/sys/intrinsics.mojo:90:14: note: LLVM intrinsic operand has unknown value: #pop<simd "1.8618819175149959"> : !pop.scalar<f64>

System information

- What OS did you do install Mojo on ? MacOs 14.6.1
- Provide version information for Mojo by pasting the output of `mojo -v` mojo 24.6.0 (4487cd6e)
- Provide Magic CLI version by pasting the output of `magic -V` or `magic --version` magic 0.5.1
- Optionally, provide more information with `magic info`.

[soraros]

Maybe related: #3613, #3258

@thatstoasty You can use triple quote mojo instead of rust for your markdown code block.