Use refTypeObj in InferMacro

[fthomas]

This is the same as #332 but for InferMacro.

[codecov]

Codecov Report

Merging #333 into master will decrease coverage by 0.26%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
- Coverage   99.03%   98.76%   -0.27%     
==========================================
  Files          38       34       -4     
  Lines         413      406       -7     
  Branches        6        6              
==========================================
- Hits          409      401       -8     
- Misses          4        5       +1

Impacted Files	Coverage Δ
...n/scala/eu/timepit/refined/macros/MacroUtils.scala	100% <100%> (ø)	⬆️
...ala-2.13.0-M2/eu/timepit/refined/api/Refined.scala	75% <0%> (-13.89%)	⬇️
...hared/src/main/scala/eu/timepit/refined/eval.scala	100% <0%> (ø)	⬆️
...in/scala-2.11/eu/timepit/refined/api/Refined.scala
...in/scala-2.10/eu/timepit/refined/api/Refined.scala

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[codecov]

Codecov Report

Merging #333 into master will decrease coverage by 2.79%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #333     +/-   ##
=========================================
- Coverage   99.03%   96.23%   -2.8%     
=========================================
  Files          38       38             
  Lines         413      425     +12     
  Branches        6        7      +1     
=========================================
  Hits          409      409             
- Misses          4       16     +12

Impacted Files	Coverage Δ
...n/scala/eu/timepit/refined/macros/InferMacro.scala	100% <ø> (ø)	⬆️
.../scala/eu/timepit/refined/macros/RefineMacro.scala	100% <ø> (ø)	⬆️
...n/scala/eu/timepit/refined/macros/MacroUtils.scala	100% <100%> (ø)	⬆️

---

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