Better error message for memory allocation in vplayground

[enghitalo]

Describe the bug

ugly panic error

Reproduction Steps

https://play.vlang.io/p/1e2bfc720e

const max_iterations = 947_009_999

fn main() {
	mut a := unsafe { malloc_noscan(max_iterations) }
	println(voidptr(a))

	mut b := unsafe { nil }
	println(voidptr(b))

	b = &[]u8{cap: max_iterations}
	println(voidptr(b))
}

Expected Behavior

better error message

Current Behavior

================ V panic ================
   module: builtin
 function: malloc_noscan()
  message: malloc_noscan(947009999) failed
     file: /home/admin/v/vlib/builtin/builtin.c.v:422
   v hash: 0514de7
=========================================
/tmp/v_60000/../../../../../../home/admin/v/vlib/builtin/builtin.c.v:66: at panic_debug: Backtrace
/tmp/v_60000/../../../../../../home/admin/v/vlib/builtin/builtin.c.v:422: by malloc_noscan
/tmp/v_60000/../../../../../../box/code.v:4: by main__main
/tmp/v_60000/../../../../../../tmp/v_60000/code.01HQC3MCD4MAQ1WSNW5QCKWS7H.tmp.c:16997: by main
Exited with error status 1

Possible Solution

No response

Additional Information/Context

No response

V version

vplaygrund version

Environment details (OS name and version, etc.)

vplaygrund OS

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[spytheman]

The playground is intentionally restricted - on RAM, CPU, and number of processes running, since it is a shared resource.

Run more demanding code locally, not on the playground.