add a warning and two explicit inlines

src/LLVM_intrinsics.jl

@@ -1,6 +1,11 @@
 # LLVM operations and intrinsics
 module Intrinsics
 
+# Note that in the functions below, some care needs to be taken when passing
+# Julia Bools to LLVM. Julia passes Bools as LLVM i8 but expect them to only
+# have the last bit as non-zero. Failure to comply with this can give weird errors
+# like false !== false where the first false is the result of some computation.
+
 # TODO: fastmath flags
 
 import ..SIMD: SIMD, VE, LVec, FloatingTypes
@@ -552,6 +557,7 @@ for (fs, c) in zip([HORZ_REDUCTION_OPS_FLOAT, HORZ_REDUCTION_OPS_INT],
  ret $(d[T]) %res
  """
  return quote
+ $(Expr(:meta, :inline));
  Base.llvmcall($(decl, s2), T, Tuple{LVec{N, T},}, x)
  end
  end
@@ -570,6 +576,7 @@ for (f, neutral) in [(:fadd, "0.0"), (:fmul, "1.0")]
  ret $(d[T]) %res
  """
  return quote
+ $(Expr(:meta, :inline));
  Base.llvmcall($(decl, s2), T, Tuple{LVec{N, T},}, x)
  end
  end