v0.34.0 unable to run amber specs on macOS Catalina

[cbortz]

Hey y'all! Reporting an issue that I'm having when trying to run the Amber framework specs on my local machine.

I'm asking in this repository rather than in the amber repository because when I install v0.34.0 via homebrew, I am able to run the specs just fine. When I run the specs with v0.34.0 installed via asdf, I get the following error:

Assertion failed: (Idx < NumElements && "Invalid element idx!"),
  function getElementOffset,
  file /var/cache/omnibus/src/llvm/llvm-6.0.1.src/include/llvm/IR/DataLayout.h,
  line 514.
/Users/me/.asdf/installs/crystal/0.34.0/bin/crystal:
  line 103: 46649 Abort trap: 6 
  "$INSTALL_DIR/embedded/bin/crystal" "$@"

To reproduce this, the command I am running is:

crystal spec ./spec/amber --debug --verbose

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Please let me know if I can provide any additional information. If any of y'all could point me in the right direction, it would be greatly appreciated!